Window-screen.



W. V. KNIGHT.

WINDOW SCREEN.

APPLICATION FILED JAN. 14, 1911.

Patented Feb.6,1912.

8 w v a w. -C... VT H d M/ WW WWI W 1 9 P y I A M w mi m .M a a M w K x a "ins WALTER V. KNIGHT, 0F WESTBBOOK,.MAIN E.

WINDOW-SCREEN.

V Specification of Letters Patent. Application filed January 14, 1911.- Serial No. 602,669.

Patented Feb. cf, 191 2.

To all whom it may concern:

Be it known that I, WALTER V. KNIGHT,

of Westbrook, in the county of Cumberland and State of Maine, have invented certain new and useful Improvements in Window- Screens, of which the following is a specification.

My invention relates to an improved construction of the screen shown and described in Letters Patent to Charles H. Knowles, dated Jan. '7, 1908, No. 875,826. This screen was made up of the usual end bars and side bars. It was held in place just outside the upper sash groove between the two sides of the casing by flat exterior stops or projections,

one on the lower end of the screen to prevent it from being forced inward. A flat interior stop or projection at about the center of each side bar was fitted within the upper sash were halved together so as to allow the extension strip to slide laterally with respect to the side bar,'always making a tight joint to exclude flies, etc.

Hitherto, the side bars of the screen and the extension strips have been made of wood and have developed in practice certain more or less serious faults. The two wooden strips being halved together, were liable to become warped when they would either'stick and move hard, one on the other or they would open joints or spaces for flies to enter. Another fault was that spiral springs, the most desirable form to use, could not be used 'to forge the strip out because the bearing surface for the end of the spring would only be substantially one half of the thickness of v the strip. The strip could not be more than {5 inch thick on account of the thickness of the casing outside of the sash groove. My invention is directed to remedyingthese defects and to substituting an extension which could be more cheaply made, and which will be more eflicient in use.

My invention consists in the features of constructions hereinafter claimed. r

I illustrate my invention by means of the accompanying drawing, in which set forth and Figure 1 shows an'elevation of the screen looking from the inside of the window outward, and with my improvement applied to one of the side bars. Fig. 2,is a vertical sectlon on the line y 3 including theupper sash and the sill. Fig. 3, isa perspective view of the side strip which embodies my muention, and Fig. 4, is an enlarged section on the line X X of Fig. 1, showing a position of the casing.

The screen frame is made up in the usual way with end bars a and b and b. An internal stop a is secured on the inside face of the side bar 15 at about the center and an external stop e is secured on the outer surface near the bottom. Both of these stops are of thin metal and project laterally be- 7 yond the side bar.

The extension strip which embodies my invention is applied to the side bar I) and is made up of a strip of sheet metal indicated generally as D. It is bent into the formof an angle bar, forming a flange d and a flange The flange d fits against the outer surface of the side bar 6 and the flange d which is the same width as the thickness of the side bar, presses against the casing f (Fig.

4) this latter casing forming the outer wall of the upper sash groove f.

The strip D has a limited horizontal motion from and toward the side bar, and to guide the strip, I form in the flange d, a horizontal slot 03 one at the top and one at the bottom, offsets d being extended out from the flange d for this purpose.

It is necessary to close the upper end of the space between the outer edge of the side bar I) and the inner face of the flange d.

For this purpose I turn over a portion d of n the upper end of'the flange 03 so that it rests on the upper end of the side bar eflectually closing this space and making a tight joint.

The external an internal stops which correspond with the stops 0 and d, I form from the metal of the strip D. The lower external stop d is formed by cutting into the flange (1 near the bottom and bending a portion outward into the plane of theflange d.

The central internal stop is formed by extending a portion of the metal of the flange cl and bending it outward to form a stop d opposite the stop C. An operating handle is formed by bending an extendedportion of the flange a3 inward to form a handle d.

I 'The handle d? rests'against the face of the of theflange d. This is rendered possible strip and all. its connecting by having the whole width of the flan ed to serve as a bearing for the outer en of the spring.

It will be seen from the above, that with a single integral piece of sheet'metal, which may e steel, galvanized iron, or other suitable metal, l form it in such a way that it performs'all the functions and contains all the parts necessary to form the expanding side bar of the Knowles screen.

In the old construction, it was necessary to use the halved strip, guide pins projecting inward from the strip, internal and external stops which must be fastened onto the sidebar, a cap piece to close the top of the opening and an operating handle which must be fastened on and long fiat-springs between the side bar and the strip as shown in the Knowles patent. I am enabled to form the arts by suitably bending a single piece 0 metal.

I claim: e 1. A device for holding a screen in a window frame, said .device comprising a bar of right-angular cross-section throughout, its

length, a pair of parallel lugs extending from the edgeofbne of the flanges of the bar adjacent theends thereof and both lugs' being disposed in the same lane with such flange to engage with the atter the outer surface of the screen frame, a lug extending laterally from the edge of the other flange at an intermediate point of the bar and extending parallel with the first-mentioned lugs though disposed in a plane to one side of the plane of the first-mentioned lugs a distance to permit the screen frame to fit between the lugs on one flangeand the lug on the other flange, a plurality of lugse tending from the bar in the o positedi'rction from the afore-mentione lugs :to engage with a portion of the window frame, -in combination with a screen, means for slid-' ably connecting the screen-engaging lugs with the said screen, and. yieldin means in 'terposed between thesaid bar an screen for urging the bar from the screen into engagement with the'window frame.

2. A devicefor holding a screen in a window frame comprising a bar composed of two flanges disposed in angular relation, one flange having at its ends laterally-extending screen-engaging lugs, each lug havin a longitudinal slot and the slot of one ug screen-engagin lug extendin point and offset from the first-mentioned lugs a distance equal. to the thickness of a screen frame, said last-mentioned lug having a longitudinal slot arallel with the slots of the first-mentioned ugs and also having an extremity formed into a handle, the flange havingthe intermediate-lug being bent lat erally at its upper end in alinement with the upper end of'the flange having the firstmentioned lugs, and window-frame engaging -lugs extending from the respective flanges of the bar in a direction opposite from the screen-engaging lu s, in combination with a screen frame fitte between the screen-engaging lugs, fastenings passing through the slots of the screen-engaging lugs for holding the ,bar attached to thescre'en frame, and

frame and barfor urging the latter away from the screen to maintain the window A WALTER vKN GHT, Witnessesi I I PERCY M. Ammnws,

S. W. BATES.

being parallel with that of the other, a

from the other flange o the bar at an-intermediate T spring means confined between the screen frame engaging lugs in'engagement with the 

